Rivet-setting machine.



lJ. W. COOMBS. RIVBT SETTING MACHINE. APAPLIGATION FILED APR.23, 1914.

Patented Feb. 16, 1915.

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FACTURING COMPANY, INCORPORATED, 0F

CORPORATION or PENNSYLVANIA.

a specification, reference being had to they accompanying drawings.

My invention relates to' a machine -by which large head rivets, such for exampleas areuscdA to protect the bottom of suit cases, are'set in` place, by driving the shank of the rivet through the leather and expanding,- the split shank upon anl anvil. `In such machines there is provided avv conical seat to which a rivet is fed and whereon it rests until the descent of a plunger'centers and drives it. By my device I have provided #a simple and novel means of effectually centering the rivet before it is driven. The same means' prevent the possible inversion of the rivet -upon the seat as sometimes occurs if the rivet is top-heavy. To this end my invention provides a pin or finger, freely mounted within the axis of the plunger, and

hangingT by its own weight to a short disfrom the rivet, when it .is seated in proper tance above the top of the rivet. This pin bears such relation to the path taken by the rivets, as they pass-from the race-way to the seat, that the pin .willbe clezn1 of contact position. As'the plunger descends the retreating pin exerts enough pressure to center the rivet before the plunger strikes and drives it. l The pin also eifectually prevents the improper inversion of the rivet.

In the accompanying drawing, the figure shows in elevation the essential parts of such a machine having my invention applied thereto.

Describing iirst those parts of the machine which are old and well known, it will be observed that the machine is provided with a cup-shaped rivet seat l, formed upon a carrier 2. The seat and carrier are cloven so as to permit each half to retreat as the plunger descends. Leading to one side of this seat is a race-way 3, provided a short distance from its lower end with a separator 4.

BiLthis separator the 'stream of rivets com# in ,fr down the racc-way is checked, andindividual rivets are tolled off and permitted to descend one at a time to the seat. A plunger 5, having a concave lower end is suitably PHILADELPHIA, PENNSYLVANIA, A.

' i Q' hiver-SETTING MacnINn.

Patentedleb. `i G, i915.

Application led Apri123., 1914,.` y SeralvNo. 533,856.

. mounted for vertical reciprocation as well known in this art. Directly below the seat and m line with the plunger is the anvil 6. Referring specifically to the parts which are of my invention, it will be observed that` of the pin, but except for this limitation y the pin hangs only by its own weight. The limit is so set that when the plunger is elevated, the lower end of the pin, which may be slightly rounded as shown, depends a short distance below the lower end of the plunger, directly over and in line with the axis of the seat and the anvil.

In the drawing, the rivet 15, is shown passing from the race-way to the seat. In

normal operation, this rivet slides into its seat without coming into contact with the lower side of the plunger, or the depending pin 1l. When the rivet has thus seated itself, the lower end of the pin 11, is elevated an appreciable distance, say about a quarter of an inch, abovethe crown of the rivet.

If the rivet as it slides into the seat, rests properly seated beneath the plunger, my device has no function to perform, and the pin merely retreats within the plunger as it descends to drive the rivet, being under such circumstances merely a harmless inoperative adjunct. But more usually the rivet does not come to rest exactly in the center of the seat. IIeretofore the concave lower end of the plunger has beenrelied upon to perform both the centering and the driving operation, and this it does although the rapidity of its motion causesthe operation of centering the rivet within its seat, to be performed somewhat harshly, sometimes with a slight distortion ofY the rivet. By the use of my invention. as the plunger descends. the lower end of the pin first contacts with the top of the rivetresting upon it by its own weight. Owing to the rounded shape of the seat upon which the rivet rests, this slight weight is sufficient i push the rivet into a central position, which it accomplishes before the lower end of the pluiiner lactually reaches the rivet, and begine to drive it. In this way suiicient time in itself to is provided topermit the centering operation to be completed before the driving voperation by the plunger begins.v

As a result of which I find that the rivet is more perfectly and accurately driven with less strain'to the rivet.

My device also performs another useful function. 4The rivet before coming to rest upon the seat, is subjected to j ars or tremors, which tend to cause a top-heavy rivet to sometimes invert unless means are provided tol prevent this. The position of the pin 11,

directly overthe top of the rivet, is such that the top of the rivet will come into contact with the end of this pin, before it can turn over, and the pin has sufficienty weight and is so situated as to prevent such inversion of the rivet.-

It is characteristic of my invention that.

the pin 11, hangs freely with capacity forvertical motion only directly over the center of the crown of the rivet, whereby it is efficacious to properly seat a bounding rivet, no matter from what direction the tendency of the rivet to invert may exert itself.

1IjIaving thus described my-invention, I c alm:

1. In a rivet setting machine, thecombination of the plunger having an axial recess, the rivet seat, a race-way leading thereto, and a pin freely received within the axial recess 1n the plunger and protruding below its lower edge when the plunger is raised,

but with capacity of retreating within the -retreating within the recess when the plunger descends upon the rivet.

In testimony whereof, I have hereunto signed my naine at Philadelphia, Pennsyl Vania, this twenty-firstlday of April, 1914.

JAMES w. cooM'Bs. 1`

Vitnesses:

JAMES H. BELL, E.'L. FULLERTON. 

